eliminate g_error() usage

Replaced all occurrences of g_error() with MPD_ERROR() located in a new header
file 'mpd_error.h'. This macro uses g_critical() to print the error message
and then exits gracefully in contrast to g_error() which would internally call
abort() to produce a core dump.

The macro name is distinctive and allows to find all places with dubious error
handling. The long-term goal is to get rid of MPD_ERROR() altogether. To
facilitate the eventual removal of this macro it was added in a new header
file rather than to an existing header file.

This fixes #2995 and #3007.

1 files changed, 36 insertions, 0 deletions

diff --git a/src/mpd_error.h b/src/mpd_error.h
new file mode 100644
index 00000000..95e12057
--- /dev/null
+++ b/src/mpd_error.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2003-2010 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_ERROR_H
+#define MPD_ERROR_H
+
+#include <stdlib.h>
+
+/* This macro is used as an intermediate step to a proper error handling
+ * using GError in mpd. It is used for unrecoverable error conditions
+ * and exits immediately. The long-term goal is to replace this macro by
+ * proper error handling. */
+
+#define MPD_ERROR(...) \
+	{ \
+		g_critical(__VA_ARGS__); \
+		exit(EXIT_FAILURE); \
+	}
+
+#endif